Double cross-arm brace



y 2, 1939- c. A. BOOKER ET AL ,447

DOUBLE CROSS-ARM BRACE Filed Nov. 8, 1957 f 1 76 07152 9 40 649/7214.7500/ke7 Avd'rew 55ZZ&.

J" 42 MM Patented May 2, 1939 UNITED STATES PATENT OFFICE 2,156,447DOUBLE CROSS-ARM BRAoE Application November 8, 1937, Serial No. 173,328

4 Claims.

This invention relates to pole and cross-arm constructions, as used insupporting transmission lines, distribution lines, or telephone ortelegraph wires.

It is the general object of our invention to provide an improved doublecross-arm brace for such purposes, so designed that it can beconveniently constructed from a single continuous piece of rolled steelrod.

Another important object of the invention is to provide a doublecross-arm brace so designed that the surface thereof is free fromcorners, holes or other inequalities, thereby insuring a better and moreuniform deposit of metal in galvanizing and reduced liability to rust.

Another very desirable characteristic of the invention is that it is soeconomical in the amount of metal used and in the manner of fabricatingthe same that our improved brace may be manu- 20 factured from suchferrous or non-ferrous metals and alloys or combinations thereof as willbest resist corrosion, in regions near the seat or where galvanizing isnot satisfactory.

A further object is to provide a double cross- 2 arm brace whichrequires no separate bolts or screws for attachment thereof to a crossarm. In a modified construction, no attaching devices whatever arerequired between the brace and the cross-arm.

30 Our invention further relates to arrangements and combinations ofparts which will be hereinafter described and more particularly pointedout in the appended claims.

A preferred form of the invention and certain 35 modifications thereofare shown in the drawing,

in which Fig. 1 is a front elevation of our improved cross-arm brace inoperative position;

Fig. 2 is a plan view, looking in the direction of the arrow 2 in Fig.1;

Fig. 3 is a sectional end elevation, taken along the line 33 in Fig. 1;

Fig. 4 is a partial sectional view, looking in the direction of thearrow 4 in Fig. 1;

Fig. 5 is a partial front elevation of a modified construction; and

Figs. 6 and '7 are similar fications.

Referring particularly to Figs. 1 to 4, we have shown a pole l? having across-arm C secured thereto by a lag screw or bolt 10, these parts beingof the usual construction.

Our improved cross-arm brace B is shown as formed from a singlecontinuous piece of relatively heavy round steel rod, and comprises twoviews of further modiarms l2 joined together by a loop or coil M, as

clearly shown in Fig. 4. This loop or coil is of such internal diameteras to freely admit a lag screw or clamping bolt [5 by which the bracemay be secured to the pole P. The overlapping 5 portions of the arms l2in the loop or coil [4 may be welded together to provide a more rigidconstruction if desired.

The outer ends of the arms l2 are offset as indicated at 16 and arethreaded at their outer ends to receive clamping nuts H.

The parts are assembled as indicated in Figs. 1 to 3, with the offsetportions l6 extending through horizontal holes in the cross arm C atopposite sides of the pole P. Washers I8 are preferably inserted underthe nuts I! as shown in the drawing. Other suitable means for securingthe offset portions IS in the cross-arm C may be substituted if desired.

From the foregoing description it will appear that we have provided anextremely simple double cross-arm brace which may be manufactured fromordinary round steel rod by a. few simple and inexpensive operations.This brace is not only low in cost of manufacture, but is highlysatisfactory in use and extremely easy to install.

In Fig. 5 we have indicated a modified construction in which the outerend of each arm 20 of the double brace is offset to provide a horizontalshoulder 2i and is again offset to provide an upwardly extending endportion 22 adapted to be inserted in a hole 23 bored into the cross-armC from the under side and extending only partially through thecross-arm.

The double brace thus constructed can be held in place by a single lagscrew or clamping bolt, and each of the arms 20 is placed in compressionby the load carried on the adjacent portion of the cross-arm.

In Fig. 6 we have shown a similar construction but with the end portion3| of each arm 30 of the brace extending entirely through the crossarm Cvertically and secured by a nut 32, threaded tothe upper end thereof.With this construction, each brace arm 30 is adapted to resist tensionas well as compression.

In Fig. '7, we have shown an alternative construction in which the arms40 are joined by a flat loop or bent portion 41, the sides of which arepreferably welded together at 42.

Our improved cross-arm brace, while commonly made from steel rod, may bemade of any other suitable metal or alloy and with or without aprotective coating.

It is to be noted that no waste material whatever is produced inmanufacturing our improved brace, so that more expensive metals can beeconomically used. Furthermore, the cross section of the brace iscommonly uniform throughout its length including the threaded endportions, so that the labor cost of manufacture is correspondingly low.7

Having thus described certain forms of our invention and the advantagesthereof, we do not wish to be limited to the details herein disclosed,otherwise than as set forth in the claims, but What we claim is:

1. A double cross-arm brace comprising a single piece of metal rod, saidbrace having two brace arms connected by an integral bolt-receivingloop, and said brace arms having integral oiTset end portions extendinginto spaced openings in said cross-arm.

2. A double cross-arm brace comprising a single piece of metal rod, saidbrace having two brace arms connected by an integral bolt-receivingloop, and said brace arms having integral oflset end portions extendingthrough spaced openings in said cross arm, and means to secure said endportions in said cross-arm.

3. A double cross-arm brace comprising a single piece of metal rod, saidbrace having diverging brace arms joined by a single-turn integralhelical loop, and said brace arms having offset end portions extendinginto spaced openings in said cross-arm.

4. A double cross-arm brace comp-rising a single piece of metal rod,said brace having diverging brace arms joined by a single-turn integralhelical loop, and said brace arms having offset end portions extendingthrough spaced openings in said crossarm, and means to secure said endportions in said cross arm.

CLYDE A. BOOKER. ANDREW E. HILL.

